Over on SharesPost, an investor just agreed to buy Facebook stock at a price of $55 per share for an implied valuation of an incredible $124 billion. That's a 62X valuation multiple on Facebook's $2 billion 2010 revenues.

That's bizarre.

But the thing is, several other investors have submitted bids implying similarly astronomical valuations. One guy wants 1,000 shares at $60 a pop, implying a $136 billion market cap.